Learning Vietnamese for boyfriends parents (read first)

So my boyfriend is Vietnamese and his family speaks Vietnamese heavily in his house. His parents know broken English but his brothers speak both (same as him) He has had a girlfriend before and they didn’t like her. I am worried that they will not like me because they want him to date a Vietnamese woman. Would it be weird to learn Vietnamese in hopes of them liking me a little more? I’ve brought the idea up to my boyfriend and he thinks they would be happy if they know I am trying but he doesn’t know for sure. I don’t want to seem like I am trying too hard to please them. Advice? Please comment as well as answering the poll :)

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